try {
  if (/Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent)) {

  } else {
    window.onload = function () {
      var canvas = document.querySelector('canvas'),
        ctx = canvas.getContext('2d')
      canvas.width = window.innerWidth
      canvas.height = window.innerHeight
      ctx.lineWidth = .3
      ctx.strokeStyle = (new Color(150)).style

      var mousePosition = {
        x: 30 * canvas.width / 100,
        y: 30 * canvas.height / 100
      }

      var dots = {
        nb: 250,
        distance: 100,
        d_radius: 150,
        array: []
      }

      function colorValue(min) {
        return Math.floor(Math.random() * 255 + min)
      }

      function createColorStyle(r, g, b) {
        return 'rgba(' + r + ',' + g + ',' + b + ', 0.8)'
      }

      function mixComponents(comp1, weight1, comp2, weight2) {
        return (comp1 * weight1 + comp2 * weight2) / (weight1 + weight2)
      }

      function averageColorStyles(dot1, dot2) {
        var color1 = dot1.color,
          color2 = dot2.color

        var r = mixComponents(color1.r, dot1.radius, color2.r, dot2.radius),
          g = mixComponents(color1.g, dot1.radius, color2.g, dot2.radius),
          b = mixComponents(color1.b, dot1.radius, color2.b, dot2.radius)
        return createColorStyle(Math.floor(r), Math.floor(g), Math.floor(b))
      }

      function Color(min) {
        min = min || 0
        this.r = colorValue(min)
        this.g = colorValue(min)
        this.b = colorValue(min)
        this.style = createColorStyle(this.r, this.g, this.b)
      }

      function Dot() {
        this.x = Math.random() * canvas.width
        this.y = Math.random() * canvas.height

        this.vx = -.5 + Math.random()
        this.vy = -.5 + Math.random()

        this.radius = Math.random() * 2

        this.color = new Color()
        console.log(this)
      }

      Dot.prototype = {
        draw: function () {
          ctx.beginPath()
          ctx.fillStyle = this.color.style
          ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false)
          ctx.fill()
        }
      }

      function createDots() {
        for (i = 0; i < dots.nb; i++) {
          dots.array.push(new Dot())
        }
      }

      function moveDots() {
        for (i = 0; i < dots.nb; i++) {

          var dot = dots.array[i]

          if (dot.y < 0 || dot.y > canvas.height) {
            dot.vx = dot.vx
            dot.vy = - dot.vy
          }
          else if (dot.x < 0 || dot.x > canvas.width) {
            dot.vx = - dot.vx
            dot.vy = dot.vy
          }
          dot.x += dot.vx
          dot.y += dot.vy
        }
      }

      function connectDots() {
        for (i = 0; i < dots.nb; i++) {
          for (j = 0; j < dots.nb; j++) {
            i_dot = dots.array[i]
            j_dot = dots.array[j]

            if ((i_dot.x - j_dot.x) < dots.distance && (i_dot.y - j_dot.y) < dots.distance && (i_dot.x - j_dot.x) > - dots.distance && (i_dot.y - j_dot.y) > - dots.distance) {
              if ((i_dot.x - mousePosition.x) < dots.d_radius && (i_dot.y - mousePosition.y) < dots.d_radius && (i_dot.x - mousePosition.x) > - dots.d_radius && (i_dot.y - mousePosition.y) > - dots.d_radius) {
                ctx.beginPath()
                ctx.strokeStyle = averageColorStyles(i_dot, j_dot)
                ctx.moveTo(i_dot.x, i_dot.y)
                ctx.lineTo(j_dot.x, j_dot.y)
                ctx.stroke()
                ctx.closePath()
              }
            }
          }
        }
      }

      function drawDots() {
        for (i = 0; i < dots.nb; i++) {
          var dot = dots.array[i]
          dot.draw()
        }
      }

      function animateDots() {
        ctx.clearRect(0, 0, canvas.width, canvas.height)
        moveDots()
        connectDots()
        drawDots()

        requestAnimationFrame(animateDots)
      }

      window.addEventListener('mousemove', function (e) {
        mousePosition.x = e.pageX
        mousePosition.y = e.pageY
      })
      window.addEventListener('mouseleave', function (e) {
        mousePosition.x = canvas.width / 2
        mousePosition.y = canvas.height / 2
      })

      window.addEventListener('resize', function () {
        canvas.width = window.innerWidth
        canvas.height = window.innerHeight
      })

      createDots()
      requestAnimationFrame(animateDots)

      const str = `数据大屏登录页面UI设计简洁明了，以直观的用户体验为核心。页面采用清晰的布局，包含品牌标识、用户名输入框、密码输入框以及登录按钮等关键元素。配色方案以企业品牌色为主，辅以中性色调，营造出专业且舒适的视觉氛围。输入框和按钮设计遵循人体工学原理，确保用户操作便捷。背景可能采用模糊处理的业务数据图像，既体现了数据大屏的特色，又增加了页面的现代感和科技感。整体设计旨在快速引导用户完成登录，进入数据大屏的主界面。`
      
      let time = 0
      for(let i = 0; i < str.length; i++) {
        if(i == 40) {
          time += 800
          setTimeout(() => {
            document.querySelector('.introduction').innerHTML += str[i]
          }, i*100 + time)
        } else {
          setTimeout(() => {
            document.querySelector('.introduction').innerHTML += str[i]
          }, i*100 + time)
        }
      }
    }
  }
} catch (e) { }